The journey began when Gwendolen Kilmuir threw herself over a bridge shortly after being insulted by Isobel Alvie. To redeem herself, Alvie made a journey of repentance to inform Mrs. Naylor that her daughter committed suicide. Lady Vespasia Cumming-Gould accompanied Alvie as a friend and to clear her own past. The voyage is almost unbearable and full of surprises but strengthens their friendship. Along the way, Gould- wondered how an insult drove Kilmuir to suicide. Cumming-Gould eventually learned that the insult was more serious than initially thought.
Overall, this murder mystery also explored heart-warming themes, such as love; forgiveness, redemption; and, atonement that apply to society today. Unlike other murder mysteries, A Christmas Journey focused on solving what secret, not which person killed the victim.